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Дисертації з теми "Enzymatic catalys"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Poliukh, К. "Modern state in the research and application of proteolytic enzymes of fungi." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50640.

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1. Braga-Silva L.A., Santos A.L. Aspartic protease inhibitors as potential anti-Candida albicans drugs: impacts on fungal biology, virulence and pathogenesis. Curr Med Chem. 2011. Vol.18 (16). P. 2401-19. 2. Ghosh A.K., Osswald H.L., Prato G. Recent Progress in the developent of HIV-1 protease inhibitors for the treatment of HIV/AIDS. Journal of medicinal chemistry. 2016. Vol. 59 (11). P. 5172–5208. 3. Kim S.Y., Gunasekaran S., Olson N.F. Combined use of chymosin and protease from Cryphonectria parasitica for control of meltability and firmness of cheddar cheese. J Dairy Sci. 2004. Vol. 87(2

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2

Debuissy, Thibaud. "Development of new polyesters by organometallic and enzymatic catalysis." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE003/document.

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Dans un contexte du développement durable, de nouvelles architectures macromoléculaires biosourcées ont été synthétisées à partir de synthons (diacides et diols) pouvant être obtenus par voies fermentaires à partir de sources carbonées issues de la biomasse. Dans un premier temps, différents copolyesters aliphatiques ont été synthétisés en masse, à l’aide d’un catalyseur organométallique à base de titane, à partir de diacides (acides succinique et adipique) et de diols (1,3-propanediol, 1,4-butanediol et 2,3-butanediol) courts. Dans un deuxième temps, des architectures macromoléculaires simila

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3

Shang, Shiying. "A Dynamical Perspective on Enzymatic Catalysis." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539626362.

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4

Romero, Rivera Adrian. "Computational studies of enzymatic and biomimetic catalysts." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/666175.

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Enzymes are the most efficient biocatalysts in Nature. However, biocatalysts in general are not capable of catalyzing reactions for industrial purposes. Hence, biocatalysts need to be engineered by introducing mutations in the active site or at distal positions in the enzyme, thereby inducing changes in the conformational dynamics of enzymes. In this thesis an analysis of conformational dynamics of several enzymes has been developed by using computational tools for understanding how their conformational dynamics affect the enzyme function. Biomimetic chemistry seeks to design novel efficient

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5

Sasi, Mohamed S. "Enzymatic and non-enzymatic catalysis of phosphoryl and sulfuryl transfer relevant to biological systems." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3906/.

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6

Semlitsch, Stefan. "Building blocks for polymer synthesis by enzymatic catalysis." Doctoral thesis, KTH, Industriell bioteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212499.

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The search for alternatives to oil-based monomers has sparked interest for scientists to focus on the use of renewable resources for energy production, for the synthesis of polymeric materials and in other areas. With the use of renewable resources, scientists face new challenges to first isolate interesting molecules and then to process them. Enzymes are nature’s own powerful catalysts and display a variety of activities. They regulate important functions in life. They can also be used for chemical synthesis due to their efficiency, selectivity and mild reaction conditions. The selectivity of

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7

Cater, Philip A. "Chemo-enzymatic studies using hydrolases and dehydrogenases." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340552.

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8

Crawford, Luke. "Mechanistic insights into enzymatic and homogeneous transition metal catalysis from quantum-chemical calculations." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7818.

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Catalysis is a key area of chemistry. Through catalysis it is possible to achieve better synthetic routes, exploit molecules normally considered to be inactive and also attain novel chemical transformations. The development of new catalysts is crucial to furthering chemistry as a field. Computational chemistry, arising from applying the equations of quantum and classical mechanics to solving chemical problems, offers an essential route to investigating the underlying atomistic detail of catalysis. In this thesis calculations have been applied towards studying a number of different catalytic pr

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9

Tomaino, Andrew R. "Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis." UKnowledge, 2014. http://uknowledge.uky.edu/cme_etds/38.

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While considerable progress has been made towards understanding the effect that membrane-based layer-by-layer (LbL) immobilizations have on the activity and stability of enzymatic catalysis, detailed work is required in order to fundamentally quantify and optimize the functionalization and operating conditions that define these properties. This work aims to probe deeper into the nature of transport mechanisms by use of pressure-induced, flow-driven enzymatic catalysis of LbL-functionalized hydrophilized poly(vinyldiene) (PVDF)-poly(acrylic acid) (PAA)-poly(allylamine hydrochloride) (PAH)-gluco

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10

Sen, Mustafa Yasin. "Green Polymer Chemistry: Functionalization of Polymers Using Enzymatic Catalysis." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258422775.

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11

Dandach, Amar. "Transformation de la cellulose en bioproduits : une approche intégrée couplant la catalyse enzymatique et la catalyse hétérogène." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1129.

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Анотація:

Ces travaux de thèse portent sur la possibilité de combiner la catalyse hétérogène et la catalyse enzymatique dans une réaction en cascade de transformation de la cellulose en produits d’intérêt. Le prétraitement enzymatique (Celluclast, un cocktail de cellulases) a été choisi comme première étape de transformation de la cellulose en vue de la fragiliser; elle est réalisée dans une solution tampon d’acide acétique et d’acétate de sodium à pH 4,75, à 50°C. Cette étape produit principalement du glucose et modifie structurellement la cellulose résiduelle en diminuant seulement son degré de polymé

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12

Düskünkorur, Hale. "Biopolyester synthesis by enzymatic catalysis and development of nanohybrid systems." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00864276.

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This thesis aims at presenting the use and development of original catalytic systems based on lipases immobilized on clays which are efficient for the synthesis of biopolyesters and allowing the preparation of organic/inorganic nanohybrids based on clay nanoparticles (sepiolite and montmorillonite) grafted with such polyesters. These nanoclays were used as lipase supports and the clay-immobilized forms of Candida antarctica lipase B (CALB) were tested for ε-caprolactone and lactide isomers polymerization. Polymerization kinetics and characterization of resulting materials have shown that lipas

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13

Scholten, Matthew John. "Enzymatic and chemical modification of fatty acid methyl esters: enzymatic catalysis of methyl linoleate using soybean lipoxygenase and chemical catalysis of methyl oleate Using Hypobromination." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/735.

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Vegetable oils are a cheap and abundant chemical feedstock which can be readily broken down into fatty acid methyl esters (FAMEs) by transesterification using methanol and a base catalyst. These FAMEs contain reactive unsaturated double bonds which can be targeted for modification. In this study, enzymatic and chemical modifications of the unsaturated double bonds of FAMEs are explored with the goal of producing higher value products. Specifically the enzymatic modification of methyl linoleate using soybean lipoxygenase and the chemical modification of methyl oleate using hypobromantion are st

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14

Sandmark, Jenny. "Enzymatic mechanisms in biotin synthesis: vitamin B₆ catalysis and phosphoryl transfer /." Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-609-x/.

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15

Lopez-Ulibarri, Rual. "A study of the enzymatic transformation of cassava starch in ultrafiltration membrane reactors." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/32308.

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Анотація:

The enzymatic saccharification of starch with Aspergillus niger glucoamylase (GA) and the isomerisation of glucose to fructose with Actinoplanes missouriensis glucose isomerase (GI) were selected as model system to explore the possibilities of using ultrafiltration membrane (UF) devices as enzymatic membrane reactors (EMR). Cassava flour was the substrate for the production of glucose syrups in two different configurations of EMR: a dead-end cell (EMR1) and a continuous stirred tank recycled through a hollow fibre device (HFMR). The optimisation of the process in the latter was also investigat

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16

Weis, James W. (James Woodward). "Artificial intelligence and protein engineering : information theoretical approaches to modeling enzymatic catalysis." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108969.

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Анотація:

Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 57-62).<br>The importance of dynamics in enzymatic function has been extensively recognized in the literature. Despite this, the vast majority of enzyme engineering approaches are based on the energetic optimization of static molecular structures. Using computational sampling techniques, especially rare-event sampling methods like Transition Path Sampling, we can now generate large datasets o

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17

Beckmann, Claus Hinrich. "New potential model systems for enzymatic metal ion and proton transfer catalysis." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625048.

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18

Dodd, Barry J. "Mechanistic studies of leaving group effects on enzymatic catalysis by methylglyoxal synthase." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/4764/.

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This thesis describes the investigations of leaving group effects on enzymatic catalysis by Methylyoxal synthase (MGS). MGS is a glycolytic enzyme involved m bacterial metabolism which catalyzes the irreversible elimination of dihydroxyacetone phosphate (DHAP). In order to probe the effect of various leaving groups to MGS catalysts, a range of' ’mutant’ substrates have been synthesised where the phosphate group of natural substrate DHAP has been replaced by sulfate, thiosulfate and bromo groups yielding the substtates dthydroxyacetone sulfate (DHAS), dihydroxyacetone thiosulfate (DHATS) and br

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19

Rodrigues, Joana Mendes Madeira. "Biodiesel production from Jathropha curcas l. oil using chemical or enzymatic catalysts." Doctoral thesis, ISA, 2016. http://hdl.handle.net/10400.5/12012.

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Doutoramento em Engenharia dos Biossistemas - Instituto Superior de Agronomia - UL<br>Jatropha curcas L. is a tropical shrub, belonging to the Euphorbiaceae family, well adapted to marginal lands, not competing for arable land and food chain. The seeds are rich in non-edible oil, suitable for biodiesel production. In this work, variation in oil content and composition of Jatropha seeds from 12 origins, grown in Mozambique under the same edapho-climatic and agronomic conditions, was assessed. Oil contents varied from 37%-45% (d.w.). The major fatty acids identified in Jatropha oil were oleic

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20

Nilsson, Karolina. "Spectrophotometric measurement automatization for the analysis of enzymatic processes." Thesis, Uppsala University, Signals and Systems Group, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-125723.

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<p>This thesis work consisted of the development of a virtual instrument that automates enzyme activity measurements and spectrum measurements with the spectrophotometer UVmini-1240. The purpose was to expand the functionality of the instrument, to eliminate the human error and to decrease the amount of time spent on measurements. A PC was connected to the UVmini-1240 via a RS-232C interface and the cell position and temperature was regulated with a CPS-240A controller. The new interface allows all the parameters to be set in the same place. It allows a visualization of the continuous monitori

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21

Yue, Conghui. "Bridging the Gap in Biomass Conversion: Understanding Enzymatic Hydrolysis of Cellulose and Hydrogenative Degradation of Lignin at the Molecular Level." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627661055938336.

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22

Kulik, Heather J. "First-principles transition-metal catalysis : efficient and accurate approaches for studying enzymatic systems." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/46389.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.<br>Includes bibliographical references (p. 211-221).<br>(cont.) We apply our approach to several paradigmatic systems: spin state splittings and structural properties of Fe2 and other small molecules as well as the addition-elimination reactions of hydrogen and methane on FeO+ to form water and methanol, respectively. We find that errors from

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23

De, Santis Lorenzo. "Theory of electron Localization Function and its Applications: Surfaces, Impurities and Enzymatic Catalysis." Doctoral thesis, SISSA, 1999. http://hdl.handle.net/20.500.11767/4428.

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24

Bögelein, Jürgen. "Influence of amorphous adjuvants on the enzymatic activity of spray dried catalase and lysozyme /." Aachen : Shaker, 2008. http://d-nb.info/988057964/04.

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25

Domingos, Renato Mateus. "Conserved structural and dynamic aspects behind Ohr enzymatic catalysis: Ohr as potential drug targets." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/41/41131/tde-07032019-090053/.

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Organic hydroperoxide resistance (Ohr) proteins are highly efficient thiol-based peroxidases that play central roles in bacterial response towards organic hydroperoxides. In Fungi, Ohr frequently presents a N-terminal extension, which is predicted to target them to mitochondria. The catalytic triad of Ohr comprises the peroxidatic Cys (Cp), the catalytic Arg (Rc) and a Glu (Ec) are fully conserved and interact among themselves by a salt bridge network in a reduced form of the enzyme (the so-called closed state). After getting oxidized to sulfenic acid (Cys-SOH), Cp condenses with the sulfhydry

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26

Chen, Yiyuan. "Regulation studies on human pyruvate kinases." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33175.

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Human pyruvate kinase performs the last step in glucose glycolysis in all cells and organisms and can be a key regulator of glycolytic flux. Pyruvate produced by PYK is transported into the mitochondria to fuel the TCA cycle, which enables the production of ATP; the main energy source of the cell. Human PYK contains four isoforms: M1 (found in muscle, heart and brain), M2 (in foetal cells and tumours), L (liver), and R (red blood cells) PYK. M2PYK plays a crucial role in tumour cell proliferation; by down-regulating metabolic flux, upstream metabolites can be used for protein and DNA synthesis

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27

Man, Hiu Mun. "Characterisation of enzymatic catalysis by microscopy and electrochemistry : application to H2/O2 bio-fuel cells." Electronic Thesis or Diss., Aix-Marseille, 2022. http://theses.univ-amu.fr.lama.univ-amu.fr/221207_MAN_82cby815lbx134rmsegm855nh_TH.pdf.

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Анотація:

Les biopiles enzymatiques, qui utilisent des enzymes pour convertir l'énergie chimique en électricité, se présentent comme l'une des ressources énergétiques alternatives et propres les plus prometteuses. Cependant, l'immobilisation fonctionnelle de ces enzymes sur une électrode pour une catalyse efficace suscite encore de nombreux défis. Afin d’accéder à des informations résolues dans l'espace, il est nécessaire de coupler l'électrochimie à d’autres techniques de surface. Dans cette thèse, la microscopie de fluorescence confocale à balayage laser a été couplée à l'électrochimie pour la caracté

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28

Woolerton, Thomas William. "Development of enzymatic H2 production and CO2 reduction systems." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:393741ac-94b1-4d56-b680-d9a434db77e2.

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One of today’s most pressing scientific challenges is the conception, development and deployment of renewable energy technologies that will meet the demands of a rapidly increasing population. The motivation is not only dwindling fossil fuel reserves, but also the necessary curtailment of emissions of the greenhouse gas carbon dioxide (a product of burning fossil fuels). The sun provides a vast amount of energy (120,000 TW globally), and one major challenge is the conversion of a fraction of this energy into chemical energy, thereby allowing it to be stored. Dihydrogen (H₂) that is produced fr

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29

Seo, Kwang Su. "Design and Synthesis of Multifuntional Poly(Ethylene Glycol)S Using Enzymatic Catalysis for Multivalent Cancer Drug Delivery." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1334600581.

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30

Liu, Xiaoling. "Polymeric Multicompartmentalized Systems Mimicking Artificial Cells for Controllable Multiple Enzymatic Cascade Reactions." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-230515.

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Engineering artificial cells is currently an emerging area of research that involves constructing mimics of biological cells. These biomimetic cellular systems hold tremendous promise for the different biomedical applications (diagnostics, therapy, tissue engineering, gene transfection, bioactive coatings) as well as aspects of synthetic biology. A key architectural principle of the cell is a multicompartmentalized assembly, which is one of the features of biological cells that enable the performance of multiple complex biochemical reactions within confined environments. For this purpose, this

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31

Lihammar, Richard. "Enzyme- and Transition Metal-Catalyzed Asymmetric Transformations : Application of Enzymatic (D)KR in Enantioselective Synthesis." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108351.

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Dynamic kinetic resolution (DKR) is a powerful method for obtaining compounds with high optical purity. The process relies on the combination of a kinetic resolution with an in situ racemization. In this thesis, a combination of an immobilized hydrolase and a transition metal-based racemization catalyst was employed in DKR to transform racemic alcohols and amines into enantioenriched esters and amides, respectively. In the first part the DKR of 1,2-amino alcohols with different rings sizes and N-protecting groups is described. We showed that the immobilization method used to support the lipase

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32

Vaida, Cristian [Verfasser]. "Functional tailor-made polyesters via chemical and enzymatic catalysis and their applications as biomaterials / Cristian Vaida." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2011. http://d-nb.info/1018187405/34.

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33

Bögelein, Jürgen [Verfasser]. "Influence of Amorphous Adjuvants on the Enzymatic Activity of Spray Dried Catalase and Lysozyme / Jürgen Bögelein." Aachen : Shaker, 2008. http://d-nb.info/1162790393/34.

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34

Maccow, Awilda. "A chemo-enzymatic approach to expand the chemical space of cellulose-derived materials : Application to eco-friendly dyeing of cellulosic fibers." Electronic Thesis or Diss., Toulouse, INSA, 2022. http://www.theses.fr/2022ISAT0054.

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Анотація:

L'extension de l'espace moléculaire chimique accessible à partir de la biomasse végétale par des méthodes douces et propres est un sujet d'actualité qui stimule la communauté scientifique afin de développer des produits biosourcés à faible impact environnemental et d'élargir le champ d'exploitation de la biomasse. La fonctionnalisation de la cellulose, le polysaccharide le plus abondant sur la planète, et/ou des cello-oligosaccharides telle que décrite dans cette thèse s'inscrit dans cette démarche. Notre objectif était de développer une méthode chimio-enzymatique impliquant l'action d'une lac

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35

Zhang, Yang. "Dynamic Systems : Enzymatic Synthesis, Exchange Reactions and Applications in Materials Science." Doctoral thesis, KTH, Organisk kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173480.

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Анотація:

This thesis is divided into three parts, revolving around the developments of dynamic systems utilized in dynamic kinetic resolution (DKR) and constitutional dynamic chemistry (CDC). The first section gives an introduction to constitutional dynamics, the core concept of this thesis. Constitutional dynamics can be tuned through reversible interactions. Then, the basic principles of constitutional dynamics in DKR and CDC are discussed, along with their applications. The second section explores the asymmetric synthesis of oxazolidinone derivatives using lipase catalysis through kinetic resolution

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36

Tang, Xiao-Jing. "Bioelectrochemical applications of reactions catalyzed by immobilized enzymes." Lund : Department of Analytical Chemistry, Lund University, Swedend, 1997. http://books.google.com/books?id=Yv5qAAAAMAAJ.

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37

Birolli, Willian Garcia. "Reações aldólicas em biocatálise: o emprego de lipases como catalisadores e a aplicação do meio reacional de miniemulsão." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/75/75133/tde-25042018-143806/.

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Анотація:

As reações aldólicas vêm ganhando destaque com os recentes avanços na área de biocatálise. Uma alternativa para o uso de aldolases, que não atuam sobre uma grande variedade de substratos e possuem custos elevados, é o emprego de enzimas de outras classes que possam exercer como função promíscua a atividade aldolase. Neste trabalho lipases e celulases foram capazes de catalisar a reação aldólica entre o 4-nitrobenzaldeído e a cicloexanona. A lipase de Rhizopus niveus (RNL) catalisou a reação aldólica em solventes orgânicos na presença de água e também em tampões aquosos. As reações condicionais

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38

Leszczak, Jean-Pierre. "Synthèse d'esters de l'acide benzoïque par catalyse enzymatique en milieu hétérogène microaqueux." Grenoble INPG, 1998. https://theses.hal.science/tel-00841819.

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Анотація:

La synthèse d'esters de l'acide benzoïque par voie enzymatique en milieu hétérogène microaqueux est envisagée. Cette estérification est possible et est catalysée par la lipase de Candida rugosa en suspension dans un mélange hexane/toluène. Le toluène permet la solubilisation de l'acide benzoique. De nombreux paramètres influencent la synthèse des benzoates de méthyle et de butyle. La teneur en eau initiale agit uniquement sur la cinétique de réaction sans modifier de manière notable la position de l'équilibre de réaction. Il est préférable, dans la mesure du possible, de travailler à une activ

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39

Dettori, Léna. "Approche multi-échelle pour l’étude de la réaction de N-acylation enzymatique d’acides aminés." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0346/document.

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Анотація:

Approche multi-échelle pour l’étude de la réaction de N-acylation enzymatique d’acides aminés La réaction de N-acylation d’acides aminés ou de peptides permet l’obtention de dérivés de ces molécules présentant des propriétés bioactives et/ou techno-fonctionnelles, avec une biodisponibilité, une hydrophobie et une stabilité accrue. Les acides aminés acylés ont été largement décrits comme constituant une classe d'agents tensioactifs avec d'excellentes propriétés de surface, des activités biologiques intéressantes, un faible potentiel de toxicité et un faible impact environnemental. Actuellement

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Nasr, Kifah. "Enzyme-catalyzed synthesis of polyesters by step-growth polymerization : a promising approach towards a greener synthetic pathway." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR030.

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La polymérisation catalysée par des enzymes a fait l'objet d'une attention croissante ces dernières années en tant qu’alternative écologique à la catalyse à base de métal. L'objectif de notre travail est de synthétiser une série de polyesters par catalyse enzymatique basée sur différents diols et diesters aliphatiques et aromatiques, où nous nous sommes concentrés sur l'influence des paramètres de réaction, des structures de monomères et avons décrit les avantages et les limites de la catalyse enzymatique dans la synthèse de polymères. L'enzyme utilisée tout au long de nos travaux était Novozy

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Gkaniatsou, Effrosyni. "Elaboration of novel enzymatic immobilization matrices, based on Metal-Organic Frameworks for the catalytic degradation of environmental pollutants." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV005.

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Les enzymes sont des biocatalyseurs de plus en plus utilisés pour la transformation de molécules organiques (chimie fine, bioconversions, dépollution, chimie du pétrole) car elles possèdent de très bonnes sélectivité et réactivité, générant rapidement de larges quantités de produit. Cependant, la fragilité des enzymes, notamment en solution, limite souvent leur utilisation. Il est donc crucial de les immobiliser et de les stabiliser dans des supports adaptés. Une grande variété de matrices d’immobilisation (organiques ou inorganiques) a déjà étudiée, mais aucune ne satisfait pleinement aux cri

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Rabin, Charlie. "Nouvelles stratégies d'amplification moléculaire d'un signal basées sur l'activation de dérivés pro-quinoniques : de l'activation d'un catalyseur biomoléculaire au déclenchement d'une réaction auto-catalytique." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC079/document.

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Généralement, diagnostiquer une pathologie donnée à un stade de développement précoce favorise le pronostic vital du patient atteint. Une telle performance nécessite de détecter des marqueurs présents à des seuils de concentrations bas dans des fluides biologiques souvent complexes. Pour détecter ces concentrations extrêmement faibles en analyte donné, la stratégie employée au cours de ce travail est l’amplification moléculaire du signal. Pour cela, différentes approches sont possibles (i) amplifier le signal issu de l’évènement de reconnaissance cible/sonde, (ii et iii) amplifier le signal pa

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Ciornii, Dmitri. "Performance-oriented strategies for integration and wiring of the photosystem I inside 2D and 3D architectures and coupling photocatalysis with enzymatic catalysis." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21813.

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In der vorliegenden Arbeit sind unterschiedliche Kopplungsstrategien des natürlichen Photosystems I (PSI) aus Cyanobakterium Thermosynechococcus elongatus mit verschiedenen Elektrodenoberflächen sowie Interaktion mit Nanomaterialien und Enzymen bearbeitet worden. Zum einen wurde gezeigt, dass die Immobilisierung des PSI auf modifizierten mehr-wandigen Kohlenstoffnanoröhrchen zur funktionalen Photobiohybridelektrode führt. Dabei wurde das PSI mit der Elektrode elektrisch mit Hilfe eines Redoxproteins, Cytochrom c (cyt c), verknüpft. Das System (PSI-cyt c) wurde auch auf eine dreidimensionale E

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Daoud, Attieh Mira. "Enzymatically initiated synthesis of biomimetic receptors based on molecularly imprinted polymers by free radical polymerization." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2266/document.

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Depuis de nombreuses années, l’utilisation d’enzyme pour la synthèse de polymères naturels ou synthétiques a largement été développée en tant que procédé alternatif plus vert et plus respectueux de l’environnement. En effet, comparée aux méthodes conventionnelles de synthèse, les enzymes offrent une sélectivité élevée, une capacité à réagir dans des conditions de réaction douces, ainsi que la possibilité de recyclage du biocatalyseur. D’autre part, les polymères à empreintes moléculaires (MIPs) sont des matériaux synthétiques avec des propriétés de reconnaissance moléculaire spécifique envers

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Kouteu, Nanssou Paul. "Mise en œuvre des lipases végétales issues des graines dans la catalyse enzymatique d’esters éthyliques d’huiles végétales pour la production de biodiesel." Thesis, Montpellier, SupAgro, 2017. http://www.theses.fr/2017NSAM0011.

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Les lipases présentent un grand intérêt pour la synthèse du Biodiesel, carburant alternatif au gasoil, généralement obtenu d’une transestérification des triacylglycérols avec un alcool, la plupart du temps le méthanol. Pour avoir un ester issu totalement de la biomasse végétale, l’éthanol peut être utilisé comme accepteur d’acyle. L’objectif de cette étude est de développer des procédés enzymatiques de synthèses d’esters éthyliques catalysés par les lipases végétales sous leur forme brute avec des intrants (huile et alcool) d’origine végétale. D’abord, elle a consisté à la mise en évidence d’u

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Desmons, Sarah. "Cycle de Calvin alternatif : catalyse chémo-enzymatique pour la transformation du dioxyde de carbone en carbohydrates et dérivés." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30200.

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Le manuscrit présente la conversion du dioxyde de carbone en sucres C3 et C4 à l'aide de réactions en cascade chimio-enzymatiques stéréocontrôlées. Le processus repose sur une stratégie en deux étapes avec (i) la réduction catalytique et sélective à 4 électrons du CO2 en un dérivé bis(boryl)acétal suivi (ii) de couplage enzymatique C-C stéréocontrôlé du dérivé bis(boryl)acétal en sucres C3 et C4. La stratégie développée est sans précédent et représente une nouvelle approche pour l'utilisation du CO2 comme source Cn pour la synthèse de biomolécules énantiomériquement pures importantes sur le pl

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Abel, Godwin Ameh. "Microalgae Fractionation and Production of High Value Nylon Precursors." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501780012745093.

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AVRAMIDOU, KALLIOPI. "BIOCATALYSIS FOR BIOMASS VALORIZATION: PROTEIN HYDROLYSATES AND SUGAR ESTERS FROM AGRI-FOOD WASTES." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/704558.

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During this doctorate work, two research topics have been studied within the aim of valorization of waste and by-products derived from the agri-food industry using a biotechnological approach for the production of high-value chemicals. The first topic was the preparation and characterization of hydrolysates from rice bran protein. Rice bran (RB) is a waste derived from the milling process of the rice and is a rich source of highly nutritional proteins, lipids, carbohydrates, and a number of micronutrients (e.g. vitamins, minerals, antioxidants, and phytosterols). The sequential treatment of RB

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Träff, Annika. "Asymmetric transformation of ß- and γ-functionalized alcohols : Study of combined ruthenium-catalyzed racemization and enzymatic resolution". Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56947.

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The major part of this thesis describes the asymmetric synthesis of β- and γ-amino alcohols through the combination of ruthenium catalyzed racemization and enzymatic kinetic resolution. The dynamic kinetic resolution, DKR, protocol for chlorohydrins was improved by employing Bäckvall’s catalyst, which is a base activated racemization catalyst, in combination with Burkholderia cepacia lipase. These optimized conditions broadened the substrate scope and improved the yields and ee’s of the obtained chlorohydrin acetates. The utility of the method was demonstrated in the synthesis of (S)-salbutamo

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Elangwe, Emilia N. "Site Directed Mutagenesis, Expression and Enzymatic Studies of the 60 kDa Human HIV-TAT 1 Interactive Protein, TIP60." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/chemistry_theses/21.

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Tip60 is a 60 kDa nuclear protein which exists in three isoforms, belongs to the MYST/HAT family of proteins and was discovered after its interaction with the Human HIV-1 Tat. As a nuclear protein, Tip60 can act as a coactivator or repressor. To understand the HAT action of Tip60, two possible catalytic models exist; the ping-pong and the ternary complex formation models. In correlation with the exploration of HAT catalytic action, mutations of a Cys to Ala and a Glu to Gln on Esa1 (yeast homolog of Tip60 and MYST/HAT prototype), was reported to show wild type-like and decreased acetylating pr

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